Adjustable support for concrete forms and scaffolding



F. J. LITTER ,8 5,747

ADJUSTABLE SUPPORT FOR CONCRETE FORMS AND SCAFFOLDING Oct 6, 1931.

Filed April 16, 1929 '3 Sheets-Sheet 1 INVENTOR Ferd/27am! (f L171 ex" ATTOR Oct. 6, 1931. F. J. LITTER 1,825,747

ADJUSTABLE SUPPORT FOR CONCRETE FORMS AND SCAFFOLDING Filed April 10. 1929 3 Sheets-Sheet 2.

INVENTOR' Ferd/04nd IL/776W "Wmtm 0d, F. J. LITTER 1, 5, 47

ADJUSTABLE SUPPORT FOR CONCRETE FORMS-AND SCAFFOLDINQ ATTORNEYS Patented Oct. 6, 1931 UNITEDISTATES,

PATENT OFFICE" v FERDINAND J. LITTER, or NEW YORK, N. Y., ASSIGNOR TO FREDERICK SNARE OORPORA 4 TION, on NEW YORK, N. Y., A CORPQRATION GENE-W YORK j r ADJUSTABLE SUPPORT FOR CONCRETE EORMSAND SCLAFFOIJDING Application filed April 10, 1929. Serial Ito. "354,162.

This invention relates tothe erecting or buildingof concrete structures. I

'More particularly stated, the invention relates to a jack device for'adjustably supporting a platform and concrete forms used in erecting structures of concrete.

One of the objectsof the invention is to provide simple and practical adjustable supporting means for concrete formsadapted it for use in erecting monolithic concrete structures.

Another object of the invention is to pro vide" a structure of the character specified so constructed and arranged that the Weight of the structures supported thereby will assist in securing the device to the member on which itis mountedand supported.

Another object of the invention is to'pr'ovide a device of the character specifiedso constructed and arranged "that it can be readily raised or lifted on its support.

Another object of the invention is to provide a device of; the character specified so constructed and arranged that theparts carried thereby will be rigidly and firmly supported. p I i Further objectslfof the'invention Will appear from the following specification taken in connection with the .drawings, which form apart of this application, and in 'which Fig. 1 is an elevational view 'partly in section," of a deviceconstructed in accord? ance-with the invention; i

j Fig. 2 is an elevational right anglestoFig. 1; V

Fig. 3 is'a sectional view taken tially on line 3+3'ofFig. 1; h

Fig; 4 is a sectional elevationon an enlarged' scale showing the adj ustable'jack-de viceconstruction;

Fig. 5 [is a sectional elevation "taken at right angles to Fig.4.; I

Fig. 6 is a sectional view taken substan tially on line 66 of Fig. 4; v p Fig. 7 is a sectional View taken substan-' tially on line 7 7 of Fig. 4:; i

view taken. at

substan- 1 Fig. 8 is a diagrammatic view-showing the devices used to construct silo walls or similar concrete structures; and

Fig. 9 is a sectional elevation,- somewhat diagrammatic showing the method of using the device toconstruct a round and substantially cylindrical wall.

The invention briefly described consists of a jack supporting device adapted to be supported on reinforcing rods set in a concrete base and adapted in turn to support a platform from which concrete can be poured and concrete forms for enclosing and confining the concrete. The device is so constructed and arranged that it can be quickly and readily adjusted vertically to raise or lift the forms and platform supported thereby. In the particular form of the invention shownpa sleeve is adjustably mounted on the rod which is set in a concrete base and the connection between the rod and sleeve is so made that the weight of the structures supported by the sleeve tends to render more rigid and firm the conmotion between the sleeve and rod. The platform and concrete forms are in turn adjustably supported on the sleeve and can beeasily and quickly raised or lowered thereon. a v v w Further details of the invention will appear from the following description.

In the" particular form of the invention I illustratedin the drawings, there is shown a rod 20 which is rigidly and securely set at its lower endin a suitable fixed support, such as a concrete base. TherodQO extends upwardly to a height corresponding to the heightof the wall or structure to be erected.

It will be understood that the rods 20 will be ali'ned or set in such "a manneras to be disposed centrally in thewall or otherstruc ture 'to' be erected. In other words, if a structure'such as a silo, circular in section, is to beerected, therods 20 will be disposed in a circl I The rods 20 are gripped by a pair of wedge shapedblocks 23and 24.

A sleeve 25 is mounted on each rod, upon which the platform and walls are to besupported. The sleeve has a square outer sectionand a cylindrical opening therethrough and, as shown in Fig. 4 at 26, is flared at its lower end. Slots 30 and 31 are formed in the flared end 26 and the wedges 23 and 24 have formed thereon laterally extending lugs 32 and 33 which extend outwardly through the slots. The lugs 32 and 36 are slotted, as shown at and 36. A pair of levers *0 and 41 are carried by links 42 and 43 which are pivoted on lugs 4-1 and -15 formed at the lower end of the flared end 26 of the sleeve 25. At their upper ends the levers and 41 have pins or studs which are disposed in the slots 35 and 36 of the lugs 32 and The wedges 23 and 24 are serrated at 21 on their inner surfaces to grip the rod, and have inclined outer surfaces 51 and 52 adapted to engage the inner tapered surface of the sleeve ends 26. As the levers are swung down to the positions shown in full lines in Fig. 4, the wedges will be forced inwardly by a toggle action and their serrated surfaces will engage the rod. Furthermore, by reason of the pin and slot connection between the levers and the wedges, the weight supported by the sleeve 25 in a manner hereinafter described will tend to force the wedges into tighter eng ement with the rod.

The sleeve 25 has a set of notches 50' and 51' formed on opposite sides thereof and a yoke 52 is slidably mounted on the sleeve. The yoke is preferably made in two sections which are secured together by bolts 53, and each end of the yoke has an opening 54 adapted to receive a handle.

The yoke is supported on the sleeve by a pair of pawls 55 and 56 mounted on pivots 57 and 58. It will be seen from the showing in Fig. 4 that the notches 50' are staggered with respect to the notches 51 and that pawl teeth 60 and 61 of the pawls 55 and 56 simultaneously engage the notches 50' and 51. Each pawl has an extension or tail 63 which normally tilts the pawl on its pivot in a direction to project the teeth 60 and 61 into the notches. The pawls 55 and 56 are also provided with teeth 59. and 64 which are disposed on the opposite sides of the pivots 57 and 58 from the teeth 60 and 61.

When the pawls are tilted in the manner shown in Fig. 4 and the yoke is oscillated, the yoke and part supported thereby will be lifted or raised on the sleeve 25. When it is desired to raise one of the sleeves on the rod. the wedges carried thereby are loosened and the pawls are tilted about their axes, so that the teeth 59 and 64 will alternately engage the notches 50 and 51'. The oscillation of the yoke will then cause the sleeve to be raised for another lift, it being understood that the platform will be sustained by adjacent jacks during this operation.

The yoke 52' has a pair of oppositely project-ing trunnions 65 and 66 secured thereto and projecting laterally therefrom. Each trunnion has mounted thereon a frame member or bracket 67, the brackets having flanges 68 and depending portions or bars 70. Set screws 95 secure the brackets 67 on the trunnions 65 and 66. Horizontal frame members 71 are secured to the flanges 68 and have secured thereto and depending therefrom vertical frame members 7 5 and 76 and braces or struts 77 and 78. Platform supporting members 86 are carried by the frame members 75, 76, 7

l and 78 and are also supported by braces or frame members 81, 82, 83 and 84 which extends downwardly from the members 80 and are connected to a common member 85. The member 85 is also connected to the lower ends of the vertical frame members and 76 and the braces 77, 78, 82 and 83 are connected at common points to the platform supports 80. The supports have mounted thereon platforms formed of a plurality of planks 87.

The concrete forms in this case consist of a pair of plates 90 and 91 which are secured to the vertical frame members 7 5 and 76 and are supported thereby.

In order to maintain the depending portions or bars 70 in veitical position, the side walls of the flared end 26 of the tubular member or sleeve 25 have extending laterally therefrom, a pair of spaced lugs 90 and 91' which receive thcrebet-ween a vertical rib 92 formed on the bars 70.

It will be understood that as many lifting devices may be provided as are necessary for supporting the pouring platform and the concrete forms. The devices may be used, for instance, in the manner illustrated in Figs. 8 and 9 on circular struc- 105 tures or may be used to support forms for constructing ordinary straight walls. .Any suitable cross struts and bracing means, such as that shown in Fig. 9, may be used to support the platform between the lift 110 ing devices and since such braces and struts form no part of the invention, a detailed description of the construction shown in Figs. 8 and 9 is not deemed necessary.

\Vhen a platform is supported on a plu- 1 5 rality of lifting devices, it will be understood that the platform will be raised by operating all of the devices simultaneously.

From the showing in Fig. 4 and the description in the foregoing specification, it 12 will be clear that the oscillation of the yoke 52' will cause the yoke to be raised on the sleeve, step by step, the yoke being tilted alternatelyon the pawls 60 and 61.

From the foregoing description it should 125 be evident that simple, practical and efficient means have been provided for adjustably supporting concrete forms and supporting platforms and that the supporting means can be readily and quickly raised, 1

thus making it possible to pour a wall in successive vertical increments. Also, it will be evident that by tilting the pawls on their pivots, the sleeves can be raised. Furthermore, as has been explained, the weight supported by the sleeves 25 tends to force the wedges 23 and 24 into tight gripping engagement with the rods 20.

Although one specific embodiment of the invention has been particularly shown and described, it will be understood that the invention is capable of modification and that changes in the construction and in the arrangement of the various cooperating parts may be made without departing from the spirit or scope of the invention, as expressed in the following claims.

What I claim is:

1. In combination, a reinforcing rod, a sleeve slidable on said rod, said sleeve having a tapered end, a pair of wedge shaped blocks in said'tapered end, and levers for forcing said blocks into gripping engagement with said rod.

2. In combination, a reinforcing rod, a sleeve slidable on said rod, said sleeve having a tapered end, a pair of wedge shaped blocks in said tapered end, and toggle means for forcing said blocks into gripping en gagement with said rod.

3. In combination, a reinforcing rod, a sleeve slidable 011 said rod, said sleeve having a tapered end, a pair of wedge shaped blocks in said tapered end, and levers for forcing said blocks into gripping engagement with said rod, said blocks being carried by said levers.

4. In combination, a reinforcing rod, a sleeve slidable on said rod, said sleeve having a tapered end, a pair ofwedge shaped blocks in said tapered end, and levers for forcing said blocks into gripping engagement with said rod, said blocks being connected to said levers by a lost motion connection. I

5. In combination, a reinforcing rod, a sleeve slidable on said rod, said sleeve having atapered end, a pair of wedge shaped blocks in said tapered end, and levers for forcing said blocks into gripping engagement with said rod, said blocks being car ried by said levers and movable relative thereto.

6. In combination, a reinforcing rod, a sleeve slidable on said rod, said sleeve having a tapered end, a pair of wedge shaped blocks in said tapered end, and levers for forcing said blocks into gripping engagement with said rod, saidblocks being connected to said levers by a pin and slot connection.

7. In combination, a reinforcing rod, a sleeve slidable on said rod, said sleeve having a tapered end, a pair of wedge shaped blocks in said tapered end, and means for forcing said blocks into gripping engagement with said rod.

8. In combination, a reinforcing rod, a sleeve adjustably supported thereon, a yoke mounted on said sleeve, and pawls carried by the yoke engageable with the sleeve to support the yoke thereon.

9. In combination, a reinforcing rod, a sleeve adjustably supported thereon, a yoke mounted on said sleeve, and pawls carried by the yoke engageable with the sleeve to support the yoke thereon, said yoke being oscillatable on said pawls to vertically adjust the yoke on the sleeve.

10. In combination, a rod, a sleeve adjustably mounted thereon, a yoke adjustably mounted on said sleeve, brackets pivotally supported on said yoke, a platform frame carried by said brackets, and supporting means carried by said brackets.

11. In combination, a reinforcing rod, a sleeve adjustably supported thereon, a yoke mounted on the sleeve, a pair of double acting pawls carried by the yoke and engageable with the sleeve, said pawls being adapted to effect relative movement between the yoke and sleeve as the yoke is oscillated.

12. In combination, a reinforcing rod, a sleeve adjustably supported thereon, a yoke mounted on the sleeve, a pair of double acting pawls carried by the yoke and engage able with the sleeve, said pawls being adapted to effect relative movement between the yoke and sleeve in one direction or the other as the yoke is oscillated.

13; In combination, a reinforcing rod, a sleeve adjustably supported thereon, a yoke mounted on the sleeve, a pair of double acting, pivoted pawls carried by the yoke and engageable with the sleeve, said pawls being adapted to effect relative movement between the yoke and sleeve in one direction or the other as the yoke is oscillated.

FERDINAND J. LITTER; 

